Numerical Investigation of the Influence of Rock Characteristics on the Soil-Rock Mixture (SRM) Slopes Stability
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0034-1
Geotechnical Engineering
Numerical Investigation of the Influence of Rock Characteristics on the Soil-Rock Mixture (SRM) Slopes Stability Shiqi Liua,b, Huanling Wangb,c, Weiya Xua,b, Zhichao Chenga,b, Zhipeng Xianga,b, and Wei-Chau Xied a
Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China c Key Laboratory of Coastal Disaster and Defense, Ministry of Education, Hohai University, Nanjing 210098, China d Dept. of Civil and Environmental Engineering, University of Waterloo, Waterloo N2L 3G1, Canada b
ARTICLE HISTORY
ABSTRACT
Received 4 March 2020 Revised 31 May 2020 Accepted 22 June 2020 Published Online 10 September 2020
Soil-rock mixture is a widely distributed geological material in mountainous regions, where slope stability is an important issue. To investigate the influence of rock on slope stability, firstly, rocks in SRM are generated and then SRM slope models are simulated based on the finite difference method (FDM). The impact of various characteristics of rocks on slope factor of safety (FOS) is studied systematically by using the reduced strength method. The characteristic of rock considered include rock content, number of rock edges, aspect ratio, rock size and inclination of rock. The simulations indicate that increasing the rock content can prevent the development of high strain region and improve slope stability. However, the aspect ratio of rock has negligible impact on the mean value of FOS. For slopes with 45o slope angle, rocks with 45o angle of inclination result in smooth potential sliding surface, whereas rocks with 135o angle of inclination lead to more tortuous potential sliding surfaces. Statistical indices are utilized to analyze the results of numerical modelling.
KEYWORDS Soil-rock mixture Slope stability Rock shape Factor of safety Reduced strength method
1. Introduction Soil-rock mixture (SRM) is a typical heterogeneous geo-material widely distributed in mountainous regions. SRM is generally comprised of a certain proportion of rocks and soil (Li et al., 2004; Xu, 2008) and is ubiquitous in slopes and landslides (Cen et al., 2017; Zhang et al., 2017). Due to the variabilities of soilrock mixture in lithology, spatial distribution, and mechanical properties, the stability of slopes are greatly affected; hence, accurate analysis of the mechanical behavior of this geo-material is very challenging (Medley, 2007; Coli et al., 2012; Tsesarsky et al., 2016; Meng et al., 2019). However, engineers have often neglected the influence of rocks on the stability by treating SRM as pure soil (Li et al., 2011; Kalender et al., 2014). Although this simplification offers a safer treatment of engineering, the behavior of SRM slopes cannot be accurately recognized (Haneberg, 2004; Sonmez et al., 2016). With the development of computers technology, many num
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